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Atomic Theory: Dalton → Thomson → Millikan � ...
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Which sequence correctly shows how the understanding of atomic structure changed?
 
Solid sphere → Electron inside → Charged nucleus
 
Nucleus → Electron → Atom
 
Electron → Nucleus → Atom
 
Nucleus → Solid sphere → Electron cloud
Which experiment first revealed that atoms contain empty space?
 
Gold foil
 
Cathode ray tube
 
Oil drop
 
Flame test
Which scientist’s work allowed the calculation of the electron’s mass?
 
Thomson + Millikan
 
Thomson alone
 
Millikan alone
 
Rutherford + Dalton
In modern terms, which part of Dalton’s theory is still correct?
 
Atoms make up all matter
 
Atoms are identical
 
Atoms cannot be divided
 
Atoms have no internal structure
Which scientist first suggested atoms were the smallest unit of matter?
 
Dalton
 
Thomson
 
Rutherford
 
Millikan
What did all four scientists ultimately show about atomic models?
 
They improve as new evidence appears
 
They never change
 
They are guesses
 
They are all correct
What type of radiation did Rutherford use?
 
Alpha particles
 
Gamma rays
 
Beta particles
 
Electrons traveled in circles
Which observation from Rutherford supported the existence of a nucleus?
 
A few alpha particles rebounded
 
Oil droplets floated
 
Cathode rays glowed
 
Electrons traveled in circles
Which scientist provided the first experimental evidence that atoms are not solid spheres?
 
Thomson
 
Dalton
 
Millikan
 
Rutherford
Which part of the atom takes up most of its space?
 
Electron cloud
 
Nucleus
 
Proton field
 
Neutron layer
The fact that a few alpha particles bounced back suggested the nucleus was:
 
Dense and positive
 
Very large
 
Spread out
 
Negatively charged
In Rutherford’s experiment, what would the plum-pudding model have predicted?
 
Almost no deflections
 
Heavy deflections
 
All alpha particles bounce back
 
Even scattering
Millikan’s data showed that the electron’s charge was always a multiple of one small value. This proved that charge is:
 
Constant and quantized
 
Random
 
Changing with temperature
 
Increasing
Millikan adjusted the electric field until droplets stopped falling. What did this allow him to determine?
 
The electron’s charge
 
The speed of the droplet
 
The droplet’s volume
 
The nucleus’s size
Millikan suspended oil droplets between charged plates. What force pulled the droplets downward?
 
Gravity
 
Electromagnetic force
 
Friction
 
Light pressure
What charge did Thomson conclude the particles in the cathode ray carried?
 
Negative
 
Positive
 
Neutral
 
Changing
What caused the cathode ray to bend in Thomson’s experiment?
 
Electric and magnetic fields
 
A chemical reaction
 
emperature changes
 
Gravity
What evidence showed Thomson that the particles in the cathode ray had mass?
 
They cast a shadow
 
They traveled in circles
 
They emitted light
 
They bounced off the tube walls
Which idea from Dalton helped explain why chemical reactions always follow the same proportions?
 
Atoms combine in fixed ratios
 
Atoms have a nucleus
 
Atoms are indivisible
 
Atoms have isotopes
According to Dalton, what combines in whole-number ratios to form compounds?
 
Atoms
 
Electrons
 
Elements
 
Nuclei
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